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On a 2006 or 335i, I would change it preventively. The water pump design was changed IIRC. Also heat seems to be a contributing factor in the case of the 335i.
I wouldn't do it on a 2007+ N52. I hope not to regret it! I check monthly my codes...
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2007 E90 AW 323i Step | Lowered 1.25"/1" | BMW Performance Exhaust | PBX | Debadged | Scangauge II | Style 162 18" & 161 17" wheels & rear 15mm spacers
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